Research On Application Of Vehicle-Infrastructure Cooperative Technology In Intersection Environment

The intersection of urban road is the high incidence of traffic accidents,accounting for about 30% of the total traffic accidents.Because of the limitations of traffic lights and the randomness of vehicles at intersections,the traffic efficiency of vehicles at intersections is not high.At the same time,the environment at intersections is the most complex.It contains a series of traffic information such as vehicles and traffic lights,and how to make vehicles safe and fast cross intersections has become a technical difficulty and hot spot.Cruise control system has been proposed to solve the existing traffic safety and traffic efficiency problems.The traditional cruise control system is mainly based on radar sensors,but radar sensors have shortcomings of short sensing distance,long-distance and beyond-the-horizon objects can not be perceived in advance.Vehicle-infrastructure cooperative technology is based on wireless communication technology,which has the advantages of low delay,stable and reliable links outside the visual range or in bad weather.Aiming at the problems existing in the cruise control system based on radar,this paper proposes a cruise control system based on vehicle-infrastructure cooperative technology,which can further improve the traffic safety and efficiency of intersections.However,cruise vehicles will have blind driving areas and must abide by traffic rules.In order to further improve the scene of cruise control system for vehicles at intersections,this paper studies the scene of blind area monitoring and traffic information warning based on vehicle-infrastructure cooperative technology.The main research work and results are as follows:(1)In order to improve traffic safety and efficiency at intersections,a cruise control system based on vehicle-infrastructure cooperative technology is proposed and studied.The structure block diagram of the cruise control system and the flow chart of the algorithm of the constant distance strategy based on workshop are designed.The simulation experiments are carried out on the joint simulation platform of CARSIM and SIMULINK to verify the effectiveness of the strategy algorithm.Finally,the validity of the strategy is verified by the simulation results.The feasibility and stability of the system are verified by real vehicle test.(2)The scene of blind spot monitoring system based on vehicle-infrastructure cooperative technology is studied.Based on the analysis of the relevant standards of international intelligent transportation system and the functional requirements and test specifications of Chery's auxiliary system for lane change,the calculation of lateral distance and the transformation process of longitude-latitude coordinate system are studied,and the information of blind area vehicles can be accurately obtained.At the same time,the human-computer interaction interface is designed.The test results of real vehicles show that the system can accurately predict the blind area of vehicles.(3)After the data interaction between simulating traffic lights and on-board vehicle-infrastructure cooperative equipment,the vehicle can get the traffic suggestion of the vehicle at the intersection,and also design the human-computer interaction interface.Finally,the actual vehicle test results show that the system can accurately output the traffic suggestion information.